TITLE: GCN CIRCULAR NUMBER: 16783 SUBJECT: GRB 140903A: NOT optical and NIR observations DATE: 14/09/05 14:11:50 GMT FROM: Dong Xu at DARK/NBI D. Xu (DARK/NBI), S. Geier (ESO), D. Malesani, J. P. U. Fynbo (DARK/NBI), J. Harmanen (NOT), A. J. Levan (U. Warwick), P. Jakobsson (U. Iceland) report on behalf of a large collaboration: We observed the field of the short GRB 140903A (Cummings et al., GCN 16763) using the 2.5m Nordic Optical Telescope (NOT) equipped with StanCam and NOTCam. We observed for a total of 20 and 30 min in the R- and H- bands, respectively. The middle times of the observations are 29.898 hr and 30.315 hr after the BAT trigger, respectively. The previously reported object (Capone et al., GCN 16769; Cenko et al., GCN 16770; Fruchter, GCN 16776; Dichiara et al., GCN 16781) is clearly detected in our R- and H-band stacked images. We found R=20.1+/-0.5 mag calibrated with nearby SDSS stars and H=16.1+/-0.3 mag calibrated with the nearby 2MASS stars. Note that a fuzzy source is present at the same position in the SDSS field, especially in z-band. Together with the pre- and post-burst observations, the optical brightness of the object either varies slowly or remains constant (see also Fruchter, GCN 16776), which implies that what we're observing in optical is basically the host galaxy of the burst. [GCN OPS NOTE(05sep14): Per author's request, the affilliation of SG was changed to ESO.]